[wideawake]

Meaningless to some perhaps..

So, according to the definitions you've supplied, Ken Lay was "a crook who tended to gather into a whole."

[Praxeus]

I am sorry you have a problem with grammatical considerations, but the definition and phrasing work fine.

Mass murderer, mass criminal. No difference.

Read some books, search the internet. The phrasing was in use long before this instance.

[Lazamataz]

So, according to the definitions you've supplied, Ken Lay was "a crook who tended to gather into a whole."

So was this guy: